In this week's episode, I speak with David Barnard, a well-known independent app developer, the host of the Sub Club podcast , and the Growth Advocate at RevenueCat . This is the fourth installment of the MDM Mailbag series, where questions for guests are sourced from the Mobile Dev Memo community. Among other things, we discuss: The viability of link-out following Apple's policy change and how developers are integrating it; How independent app developers can build sustainable businesses; Retention strategies for subscription apps; When developers should utilize subscription monetization versus other forms. Thanks to the sponsors of this week’s episode of the Mobile Dev Memo podcast: INCRMNTAL . True attribution measures incrementality, always on. ContextSDK . ContextSDK uses over 200 smartphone signals to detect a user’s real-world context, allowing apps to deliver perfectly timed push notifications and in-app offers. Interested in sponsoring the Mobile Dev Memo podcast? Contact Marketecture .